So I recently got a Nexus 7 tablet, (in fact I’m writing this post on it) and I wanted to put a different wallpaper image on it. After a lot of research and trial and error here’s what I came up with:
Size: 1600×1280
Resolution: 144 ppi
I don’t know if those are the official specs, but they worked the best for me. So if you have a Nexus 7 and want to make your own wallpaper I hope this helps.